Basic File handling program in java with Output/input Stream

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import java.io.*;

class fileH
{
public static void main(String args[])throws IOException
{
BufferedReader obj=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter a number of elements");
int n=Integer.parseInt(obj.readLine());

FileOutputStream fos=new FileOutputStream("Stu.dat");
DataOutputStream dos=new DataOutputStream(fos);
for(int a=0;a<n;a++)
{

System.out.println("Enter serial number");
int c=Integer.parseInt(obj.readLine());
System.out.println("Enter Name");
String N=obj.readLine();
dos.writeInt(c);
dos.writeUTF(N);

}

fos.close();
dos.close();

FileInputStream fis=new FileInputStream("Stu.dat");
DataInputStream dis=new DataInputStream(fis);
while(dis.available()!=0)
{

int d=dis.readInt();
String e=dis.readUTF();
System.out.println(d+" "+e);
}

fis.close();
dis.close();
}
}